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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Total gross intangible asset subject to amortization | $ 3,913 | $ 3,500
Accumulated amortization | (1,945) | (1,847)
Total net intangible assets subject to amortization | 1,968 | 1,653
Intangible assets not subject to amortization | 156 | 154
Total net intangible assets | 2,124 | 1,807
Trademarks and tradenames |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Intangible assets not subject to amortization | $ 156 | 154
Recorded music catalog |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 11 years |
Total gross intangible asset subject to amortization | $ 1,028 | 876
Music publishing copyrights |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 26 years |
Total gross intangible asset subject to amortization | $ 1,721 | 1,597
Artist and songwriter contracts |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 13 years |
Total gross intangible asset subject to amortization | $ 994 | 862
Trademarks |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 16 years |
Total gross intangible asset subject to amortization | $ 83 | 81
Other intangible assets |  |
Finite Lived And Indefinite Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life | 6 years |
Total gross intangible asset subject to amortization | $ 87 | $ 84

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